The second track-plugin skill the owner asked for: assemble a flat backlog into
4-7 perennial thematic workpackages. Mirrors present-decision (tool-neutral,
human-ratified proposal, never auto-writes).

- skills/propose-workpackages/ (SKILL.md + assets): cluster by durable concern /
  owning artifact (down-weight M\d/v\d/BR-\d/Lot timeline prefixes), one WP per todo
  (surface homeless, split cross-cutting, never multi-home), preserve owner seams
  (D5 != M5), emit a proposal (compose present-decision for big restructurings),
  apply via item new --role workpackage + item reparent, verify with report --wp.
- track install-skills generalized: discovers + installs EVERY skill under skills/
  (present-decision + propose-workpackages) to claude/codex/gemini-agy; graceful +
  idempotent; per-skill AGENTS.md pointers under one ## Skills section.

Additive; event contract / write path / P0 guard untouched. 451 tests (single-
threaded; parallel-run timeouts were host-load only), typecheck + build green.
Completes WP2. 0.10.9.